Northvision and many other Eurovision type contests are fan-made and select entries for each country so usually they don't have live performances or anything, they just use the music videos, so all the contestants probably don't know they are involved, it's like all of the Instagram fan contests :)) Hope that helps!!
Evangelia is such an amazing artist!! Her whole discography is full of masterpieces like Fotiá. What really disappoints me is, that she actually submitted a song for Eurovision 2023 and didn't even get shortlisted...(it's her song Páli btw)